Call for witnesses to WA motorcycle crash

A motorcyclist has been killed in a crash on the Kwinana Freeway in Perth's southern suburbs.

The rider was killed when the yellow Suzuki motorcycle they were riding collided with a black Ford Territory in the southbound lanes in Mount Pleasant at 1am (WST) on Wednesday.

Police say the rider died at the scene while driver of the car was not injured.

The accident caused major traffic delays for commuters travelling into the city hours later.

Major crash investigators want to hear from anyone who was travelling on the Mount Henry Bridge at the time of the collision, and anyone who may have been travelling along the freeway and saw either vehicle before the crash.

Anyone with information is asked to call Crime Stoppers on 1800 333 000.